Package-type compressor

ABSTRACT

A package-type compressor is provided which reduces the leakage of noise generated by a heat exchanger without suppressing the flow rate of cooling air to an electric motor. 
     The package-type compressor includes a cooling fan  12  that induces a flow of cooling air, an inlet duct  15 A that introduces the cooling air from a cooling air inlet  13 A to heat exchangers  3  to  6 , a plurality of louvers  16  disposed in the inside of the inlet duct  15 A, and another inlet duct  15 B that introduces the cooling air from another cooling air inlet  13 B to an electric motor  1 . The cooling air inlet  13 A is disposed such that the position thereof in the vertical direction is same as that of the heat exchangers  3  to  6 . Each of the louvers  16  has a linear portion  19 A that extends in a direction perpendicular to the cooling air passage surface of the heat exchangers  3  to  6  such that it is inclined to the upper side toward the heat exchangers  3  to  6  and another linear portion  19 B that extends in a direction diagonal to the cooling air inlet  13 A such that it is inclined to the upper side toward the cooling air inlet  13 A.

TECHNICAL FIELD

The present invention relates to a package-type compressor.

BACKGROUND ART

Patent Document 1 discloses a package-type compressor. The package-type compressor includes an electric motor, a compressor main body in the low pressure stage that is driven by the electric motor to compress the air, an intercooler (heat exchanger) that cools the compressed air discharged from the compressor main body in the low pressure stage, a compressor main body in the high pressure stage that is driven by the electric motor to further compress the compressed air cooled by the intercooler, a precooler (heat exchanger) and an aftercooler (heat exchanger) that cool the compressed air discharged from the compressor main body in the high pressure stage, and an oil cooler (heat exchanger) that cools lubricant to be supplied to the compressor main bodies in the low pressure stage and the high pressure stage.

The package-type compressor includes a housing that accommodates the equipment mentioned above therein, and a cooling fan that induces a flow of cooling air in the housing. A first cooling air inlet is formed on one side surface of the housing and a second cooling air inlet is formed on another side surface of the housing, and a cooling air outlet is formed on an upper surface of the housing. The cooling fan induces a flow of cooling air that is taken in from the first and second cooling air inlets and exhausted from the cooling air outlet.

The package-type compressor includes a first inlet duct that introduces cooling air from the first cooling air inlet to the plurality of heat exchangers described above, a plurality of louvers disposed in the inside of the first inlet duct so as to be spaced from each other in the vertical direction, a second inlet duct that is disposed on the lower side of the first inlet duct and introduces cooling air from the second cooling air inlet to the electric motor, and an outlet duct configured such that it derives the cooling air from the plurality of heat exchangers to the cooling air outlet and that the cooling air having passed the electric motor is merged into the derived cooling air.

The plurality of heat exchangers are disposed at a central portion of the housing so as to be spaced away from the first cooling air inlet and the cooling air outlet. Consequently, noise generated by the heat exchangers is reduced from leaking to the outside of the compressor. Further, the plurality of heat exchanges are disposed above the electric motor. Consequently, the installation area of the compressor is reduced. Furthermore, the plurality of heat exchanges are disposed such that the cooling air passage surfaces thereof are inclined with respect to the vertical direction. Consequently, the height dimension of the compressor is reduced.

An upper edge of the first cooling air inlet is positioned lower than an upper portion of the plurality of heat exchangers (particularly, lower than an upper edge of a front surface of the aftercooler), and a lower edge of the first cooling air inlet is positioned lower than a lower portion of the plurality of heat exchangers (particularly, lower than a lower edge of a front surface of the intercooler or the oil cooler). The first inlet duct is configured so as to be inclined to the lower side from the heat exchangers toward the first cooling air inlet. Each of the louvers is configured from a first linear portion positioned on the heat exchangers side and extending in a horizontal direction (in other words, in a direction diagonal to the cooling air passage surface of the heat exchangers), a second linear portion positioned on the first cooling air inlet side and extending in the horizontal direction (in other words, in a direction perpendicular to the first cooling air input), and a third linear portion interposed between the first linear portion and the second linear portion and inclined to the lower side from the heat exchangers toward the first cooling air inlet. By the disposition of the first cooling air inlet and the structure of the first inlet duct and the louvers described above, noise generated in the heat exchangers is reduced from leaking to the outside of the compressor.

PRIOR ART DOCUMENT Patent Document

-   Patent Document 1: JP-2010-127234-A

SUMMARY OF THE INVENTION Problem to be Solved by the Invention

With the prior art described above, it is possible to reduce noise generated by the heat exchangers from leaking to the outside of the compressor by the disposition of the first cooling air inlet and the structure of the first inlet duct and the louvers. However, the first inlet duct is elongated in the vertical direction, and the size of the second inlet duct is restricted in order to avoid interference of the second inlet duct with the first inlet duct. Therefore, the flow rate of cooling air to the electric motor is suppressed.

The present invention has been made taking the matters described above into consideration, and one of subjects of the present invention is to reduce the leakage of noise generated by a heat exchanger without suppressing the flow rate of cooling air to an electric motor.

Means for Solving the Problem

In order to solve the subject described above, the configuration described in the claims is applied. Although the present invention includes a plurality of means for solving the subject described above, according to one example, there is provided a package-type compressor that includes: an electric motor; a compressor main body that is driven by the electric motor to compress gas; a heat exchanger of air cooling type, the heat exchanger being disposed above the electric motor and cooling fluid; a housing that accommodates the electric motor, the compressor main body, and the heat exchanger therein; a first cooling air inlet formed on one side surface of the housing; a second cooling air inlet formed on the one side surface or another side surface of the housing; a cooling air outlet formed on an upper surface of the housing; a cooling fan that induces a flow of cooling air that is taken in from the first and second cooling air inlets and exhausted from the cooling air outlet; a first inlet duct that introduces the cooling air from the first cooling air inlet to the heat exchanger; a plurality of louvers disposed in a spaced relation from each other in a vertical direction in an inside of the first inlet duct; and a second inlet duct that is disposed on a lower side of the first inlet duct and introduces the cooling air from the second cooling air inlet to the electric motor, the heat exchanger being inclined at a cooling air passage surface thereof with respect to the vertical direction, in which the first cooling air inlet is disposed such that a position thereof in the vertical direction is same as that of the heat exchanger, and each of the plurality of louvers has a first linear portion that extends in a direction perpendicular to the cooling air passage surface of the heat exchanger such that the first linear portion is inclined to one side in the vertical direction toward the heat exchanger and a second linear portion that extends in a direction diagonal to the first cooling air inlet such that the second linear portion is inclined to the one side in the vertical direction toward the first cooling air inlet.

Advantages of the Invention

With the present invention, the leakage of noise generated by the heat exchanger can be reduced without suppressing the flow rate of cooling air to the electric motor.

It is to be noted that subjects, configurations, and advantages other than those described above become apparent from the following description.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a conceptual diagram depicting a configuration of a package-type compressor according to an embodiment of the present invention.

FIG. 2 is a front side transparent view depicting a structure of the package-type compressor according to the embodiment of the present invention.

FIG. 3 is a right side view depicting a structure of the package-type compressor according to the embodiment of the present invention.

FIG. 4 is a right side transparent view depicting a structure of the package-type compressor according to the embodiment of the present invention.

FIG. 5 is a left side transparent view depicting a structure of the package-type compressor according to the embodiment of the present invention.

FIG. 6 is a top plan view depicting a structure of the package-type compressor according to the embodiment of the present invention.

FIG. 7 is a front side transparent view depicting a structure of a package-type compressor according to a first modification of the embodiment of the present invention.

FIG. 8 is a front side transparent view depicting a structure of a package-type compressor according to a second modification of the embodiment of the present invention.

FIG. 9 is a front side transparent view depicting a structure of a package-type compressor according to a third modification of the embodiment of the present invention.

MODES FOR CARRYING OUT THE INVENTION First Embodiment

An embodiment of the present invention is described with reference to FIGS. 1 to 6 .

FIG. 1 is a conceptual diagram depicting a configuration of a package-type compressor according to the present embodiment. FIGS. 2 to 6 are a front side transparent view, a right side view, a right side transparent view, a left side transparent view, and a top plan view depicting a structure of the package-type compressor according to the present embodiment, respectively. It is to be noted that, although, in FIGS. 2 to 6 , a cooling air inlet and a cooling air outlet are depicted such that they have a structure having a numerical aperture of 100% for the convenience of illustration, they may otherwise have a mesh structure having a numerical aperture of less than 100%. Further, in FIGS. 2 and 5 , illustration of an intake filter, an intake throttle valve and an oil feeding system is omitted. Further, in FIG. 4 , illustration of louvers in an inlet duct is omitted for the convenience of illustration.

The package-type compressor of the present embodiment includes an electric motor 1 (particularly, for example, a permanent magnet motor), a compressor main body 2A in the low pressure stage that is driven by the electric motor 1 to compress the air (gas), an intercooler 3 (heat exchanger) that cools the compressed air discharged from the compressor main body 2A in the low pressure stage, a compressor main body 2B in the high pressure stage that is driven by the electric motor 1 to further compress the compressed air cooled by the intercooler 3, a precooler 4 (heat exchanger) and an aftercooler 5 (heat exchanger) that cool the compressed air discharged from the compressor main body 2B in the high pressure stage, and an oil cooler 6 (heat exchanger) hereinafter described.

The compressor main body 2A includes, as depicted in FIG. 1 , a pair of male and female screw rotors that mesh with each other, a pair of timing gears that rotate the screw rotors in synchronism with each other, and a casing that accommodates them therein, and a plurality of working chambers are formed in tooth grooves of the screw rotors. The working chambers move in an axial direction of the rotors as the rotors rotate, and sequentially perform a suction process of sucking the air, a compression process of compressing the air, and a discharge process of discharging the compressed air (compressed gas). The compressor main body 2B has a configuration substantially same as that of the compressor main body 2A.

On the suction side of the compressor main body 2A, a suction filter 7 and a suction throttle valve 8 are provided. A gear device 9 is provided between the electric motor 1 and the compressor main bodies 2A and 2B. The gear device 9 includes, as depicted in FIG. 1 , a bull gear provided on the rotary shaft of the electric motor 1, pinions individually provided at an end portion of the driving rotors (more particularly, one of the male rotor and the female rotor) of the compressor main bodies 2A and 2B and meshing with the bull gear, and a gear casing that accommodates them therein. Turning force of the electric motor 1 is transmitted through the bull gear, pinions, and so forth to drive the compressor main bodies 2A and 2B.

Lubricating oil (liquid) is reserved at a lower portion of the gear device 9. The oil reserved at the lower portion of the gear device 9 is supplied to bearings of the compressor main bodies 2A and 2B and so forth through an oil feeding system 10 (liquid supplying system). The oil feeding system 10 includes an oil cooler 6 of the air cooling type that cools the lubricating oil.

The package-type compressor of the present embodiment includes a housing 11 that accommodates the equipment described above therein, and a cooling fan 12 that induces a flow of cooling air in the housing 11. A cooling air inlet 13A is formed on a right side surface of the housing 11 (refer to FIGS. 2 and 3 ); another cooling air inlet 13B is formed on a rear side surface of the housing 11 (refer to FIG. 4 ); and a cooling air outlet 14 is formed on an upper surface of the housing 11 (refer to FIGS. 2 and 5 ). The cooling fan 12 induces a flow of cooling air that is taken in from the cooling air inlets 13A and 13B and exhausted from the cooling air outlet 14. It is to be noted that a cooling fan for exclusive use for the electric motor may be attached to the rotary shaft of the electric motor 1 as depicted in FIG. 1 .

The package-type compressor of the present embodiment includes an inlet duct 15A that introduces cooling air from the cooling air inlet 13A to the plurality of heat exchangers 3 to 6, a plurality of louvers 16 disposed in a spaced relation from each other in the vertical direction in the inside of the inlet duct 15A, another inlet duct 15B that is disposed on the lower side of the inlet duct 15A and introduces cooling air from the cooling air inlet 13B to the electric motor 1, and an outlet duct 17 that derives cooling air from the heat exchangers 3 to 6 to the cooling air outlet 14. The outlet duct 17 is configured such that cooling air having passed the electric motor 1 flows in through an opening 18 (namely, such that the cooling air merges with cooling air that has passed the plurality of heat exchangers 3 to 6).

The plurality of heat exchangers 3 to 6 are disposed at a middle portion of the housing 11 such that they are spaced away from the cooling air inlet 13A and the cooling air outlet 14. Consequently, noise generated by the heat exchangers 3 to 6 is reduced from leaking to the outside of the compressor. Further, the plurality of heat exchangers 3 to 6 are disposed above the electric motor 1. Consequently, the installation area of the compressor is reduced. Further, the plurality of heat exchangers 3 to 6 are disposed such that the cooling air passage surface thereof is inclined with respect to the vertical direction (in the present embodiment, inclined to the right side). Consequently, the height dimension of the compressor is reduced.

Here, as a feature of the present embodiment, the cooling air inlet 13A is disposed such that the position thereof in the vertical direction is same as that of the plurality of heat exchangers 3 to 6. In particular, the position of an upper edge of the cooling air inlet 13A in the vertical direction is same as that of an upper portion of the heat exchangers 3 to 6 (particularly, an upper edge of a front surface of the aftercooler 5), and the position of a lower edge of the cooling air inlet 13A in the vertical direction is same as that of a lower portion of the heat exchangers 3 to 6 (particularly, a lower edge of the front surface of the intercooler 3 or the oil cooler 6). Consequently, the inlet duct 15A becomes shorter in the vertical direction in comparison with that of the prior art of Patent Document 1. Therefore, interference between the inlet duct 15A and the inlet duct 15B can be avoided without restricting the size of the inlet duct 15B (namely, without suppressing the flow rate of cooling air to the electric motor 1).

Further, as a feature of the present embodiment, each of the louvers 16 has a linear portion 19A extending in a direction perpendicular to the cooling air passage surfaces of the heat exchangers such that it is inclined to the upper side toward the heat exchangers 3 to 6, and another linear portion 19B extending in a diagonal direction with respect to the cooling air inlet 13A (namely, in a direction that is not perpendicular to the cooling air inlet 13A) such that it is inclined to the upper side toward the cooling air inlet 13A. By this structure of the louvers 16, it is possible to reduce noise generated by the heat exchangers 3 to 6 from leaking to the outside of the compressor while suppressing pressure loss of the cooling air flow path. Particularly, noise is interrupted and attenuated by the louvers 16 and can be reduced from leaking to the outside of the compressor.

Further, in the present embodiment, the inclination angle (narrow angle) R of the linear portion 19B with respect to a horizontal plane is smaller than the inclination angle (narrow angle) a of the linear portion 19A with respect to the horizontal plane. Also from this point of view, pressure loss of the cooling air flow passage can be suppressed. It is to be noted that, although the louver 16 positioned on the uppermost side from among the plurality of louvers 16 is connected at one end thereof to the upper edge of the front surface of the aftercooler 5, it is not connected at the other end thereof to the upper edge of the cooling air inlet 13A.

From the foregoing, the leakage of noise generated in the heat exchangers 3 to 6 can be reduced without suppressing the flow rate of cooling air to the electric motor 1. Further, the inlet ducts 15A and 15B can be simplified in structure to reduce the cost.

It is to be noted that, though not described specifically in the foregoing description of the embodiment, sound absorbing material may be adhered to the inner surface of the inlet duct 15A and the outlet duct 17 or to the surface of the louvers 16. By this, noise generated in the heat exchangers 3 to 6 may be further reduced from leaking to the outside of the compressor.

Further, although the embodiment is described taking the case in which the heat exchangers 3 to 6 are disposed so as to be inclined to the right side and the linear portions 19A of the louvers 16 extend in a direction perpendicular to the cooling air passage surface of the heat exchangers so as to be inclined to the upper side toward the heat exchangers 3 to 6 while the linear portions 19B of the louvers 16 extend in a direction diagonal to the cooling air inlet 13A so as to be inclined to the upper side toward the cooling air inlet 13A, this is not restrictive. As in a first modification depicted in FIG. 7 , the heat exchangers 3 to 6 may be disposed so as to be inclined to the left side, and the linear portions 19A of the louvers 16 may extend in a direction perpendicular to the cooling air passage surface of the heat exchangers so as to be inclined to the lower side toward the heat exchangers 3 to 6 while the linear portions 19B of the louvers 16 extend in a direction diagonal to the cooling air inlet 13A so as to be inclined to the lower side toward the cooling air inlet 13A. Also with the present modification, advantages similar to those described above can be obtained.

Further, although the embodiment and the modification are described above taking the case in which each of the louvers 16 is configured from the linear portions 19A and 19B as an example, this is not restrictive. As in a second modification depicted in FIG. 8 , each of the louvers 16 may be configured from linear portions 19A and 19B and a curved portion 20 interposed between the linear portion 19A and the linear portion 19B. Further, as depicted in a third modification depicted in FIG. 9 , each of the louvers 16 may be configured from linear portions 19A and 19B, and a further linear portion 19C interposed between the linear portion 19A and the linear portion 19B and extending, for example, in a horizontal direction. Also with these modifications, similar effects to those described above can be obtained.

Further, although the embodiment and the modifications are described above taking the case in which the cooling air inlet 13B is formed on a side surface different from the one side surface of the housing 11 on which the cooling air inlet 13A is formed as an example, this is not restrictive, and the cooling air inlet 13B may be formed on the one side surface of the housing 11 on which the cooling air inlet 13A is formed.

Further, although the embodiment and the modifications are described above taking the case in which the compressor main bodies 2A and 2B are of the liquid-free type (particularly, of a type in which gas is compressed without injecting liquid into a working chamber) as an example, this is not restrictive, and the compressor main bodies 2A and 2B may be of the liquid supply type (particularly, a type in which gas is compressed while liquid such as oil or water is injected into a compression chamber).

Further, although the embodiment and the modifications are described above taking the case in which the compressor main body 2A or 2B is of the screw type and includes a pair of male and female rotors as an example, this is not restrictive. The compressor main body 2A or 2B may otherwise include, for example, a single screw rotor and a plurality of gate rotors. Further, the compressor main body 2A or 2B may be of a type different from the screw type.

Further, although the embodiment and the modifications are described above taking the case in which the package-type compressor includes the two compressor main bodies 2A and 2B and the four heat exchangers 3 to 6 as an example, this is not restrictive. In particular, it is sufficient only if the package-type compressor includes at least one compressor main body and at least one heat exchanger.

DESCRIPTION OF REFERENCE CHARACTERS

-   -   1: Electric motor     -   2A, 2B: Compressor main body     -   3: Intercooler (heat exchanger)     -   4: Precooler (heat exchanger)     -   5: Aftercooler (heat exchanger)     -   6: Oil cooler (heat exchanger)     -   11: Housing     -   12: Cooling fan     -   13A, 13B: Cooling air inlet     -   14: Cooling air outlet     -   15A, 15B: Inlet duct     -   16: Louver     -   17: Outlet duct     -   19A, 19B, 19C: Linear portion     -   20: Curved portion 

1. A package-type compressor comprising: an electric motor; a compressor main body that is driven by the electric motor to compress gas; a heat exchanger of air cooling type, the heat exchanger being disposed above the electric motor and cooling fluid; a housing that accommodates the electric motor, the compressor main body, and the heat exchanger therein; a first cooling air inlet formed on one side surface of the housing; a second cooling air inlet formed on the one side surface or another side surface of the housing; a cooling air outlet formed on an upper surface of the housing; a cooling fan that induces a flow of cooling air that is taken in from the first and second cooling air inlets and exhausted from the cooling air outlet; a first inlet duct that introduces the cooling air from the first cooling air inlet to the heat exchanger; a plurality of louvers disposed in a spaced relation from each other in a vertical direction in an inside of the first inlet duct; and a second inlet duct that is disposed on a lower side of the first inlet duct and introduces the cooling air from the second cooling air inlet to the electric motor, the heat exchanger being inclined at a cooling air passage surface thereof with respect to the vertical direction, wherein the first cooling air inlet is disposed such that a position thereof in the vertical direction is same as that of the heat exchanger, and each of the plurality of louvers has a first linear portion that extends in a direction perpendicular to the cooling air passage surface of the heat exchanger such that the first linear portion is inclined to one side in the vertical direction toward the heat exchanger and a second linear portion that extends in a direction diagonal to the first cooling air inlet such that the second linear portion is inclined to the one side in the vertical direction toward the first cooling air inlet.
 2. The package-type compressor according to claim 1, wherein an inclination angle of the second linear portion with respect to a horizontal plane is smaller than an inclination angle of the first linear portion with respect to the horizontal plane.
 3. The package-type compressor according to claim 1, wherein each of the plurality of louvers further has a curved portion or a third linear portion interposed between the first linear portion and the second linear portion. 